Grate



T. GOEBEL Aug. 4, 1931.

Filed Dec; 3, 1928 2 Sheets-Sheet 1 Fig.4.

Fig. 2.

III

. Fig.5.

Aug. 4, 1931. T, GO' BEL' 1,817,484

GRATE Filed Dec. 3, 1928 2 Sheets-Sheet 2 Fig.1

Fig. 8.

50 member is provided with" a Patented Aug. 4,1931- rA nEusz GoEnn or Lwow, POLAND Application filed December The present invention relates to grates for furnaces and'the like. I I I The principal object of the invention is to I provide a universal furnace grate which may be adapted withivery little alteration for the burning of-all kinds of solid'fue'ls from coal dust and saw dust to large coal and which may also be"constructed as a hollowgrate, a stepped grate, or a travelling grate and which furthermore is exceptionally simple and in- (-BXPGHSIVBQA.

' With this and other objects in View, e"

principal, novel feature of the invention're} sides in the particular construction and shape of the grate bars which consist of plates of obtuseangular cross'section which may, for instance, be symmetrical and which are pro: vid'ed'with projecting ribs and coned air openingsand have'lateralrprojectionsfeast on he them. The grate :bars or plates constructed in, this manner are arranged in serrated lat eralprojections on the longitudinal supporting members, which projections form pockets,

a. the longitudinal supporting members'beingat'so shaped that the upper surfaces of the grate bars form as'a whole'the fuel supporting'surface of the grate, whilstthe lower arms corre- 1spend to the cooling ribs of ordinary grate 0 According tothe invention the grate bars or plates are preferably arranged in two sec tions,the'constituent grate barsof whichfar'e I oppositely inclined, the two medial oppositely 7"7 inclined fire bars beingsupported on a ommon' transverse supportingmembe'r; Thelateral 'serratedproj ections of the lon-; gitudinal supporting members are, according to the invention, so shaped, and the's aid transverse supporting member ii's atj such. a height, that each of the grate bars, which are are ranged side by side, rests with its lateralprojections on the inclined surfacesfof the adjacent grate bar, said inclined surfaces being provided near the central part ofthe grate bar; In this mannera grate is provided which has-a surface which onlyexhibits small air openings and interstices and which, for

example, issuitable for: small fuel such as transverse supporting coal dust." If the stepped foot 3, r 1928, Serial in.

323,406, and GermanyDecember m 19 27.

which fits into correspondingly stepped lateral projections on the longitudinal sup- Jorting member, then it is posslble by making the projections in the longitudinal supporting member of suitable shape to obtain a higher orlower position of the transverse supporting member by altering. the position of the foot of the said transverse supporting member, with the result that the grate "barsassume a position of greater or less' inclination." B

thismeans a grate suitable for large or sma 1 fuel. is formed as desired. The grates according to the invention are preferably manufactured with standard longitudinal and transverse dimensions. In order to be able to employ grates of this kind in any'desired fire boxes, for instance, those of boilers or furnaces, the intermediary spaces which remain free between the surface ofthe grate and the wall of the furnace must be covered up. For this purpose according-to the invention it is preferable to employ cast extending longitudinally of the grate and provided with threelateral ribs of unequal width spaced at peripheral angles of about 120 apart from one another. According to'the breadth of the intermediary space, these covering members are arranged with one or the "other of the said ribs'on thelongitudinal or transverse edge of the grate, whilst one of the other rays rests on the wall of the furnace;

The method of adapting the universal grate for use as a stepped grate or as a travelling grate will be hereinafter described.

I Some preferred constructional forms ac cording'to the invention areillustrated by or rolled members way of example in the accompanying drawings, in which a Fig. 1 is an elevation partly in longitudinal section of a grate according to the invention, as adapted for small fuel,

Fig. 2 is'a plan of'Fig.

i Fig. 3is a transverse section of'a grate bar supporting structure showing one grate bar in place, a

Fig. 4 is across section showing a modi-' fied construction of the projections on the longitudinal supporting members, Figsy5'a'nd 6 show a grate bar in cross secti'OII" and in plan, I"

regard to the grate and the furnace wall will ,fire bridge.

Fig. 7 is a longitudinal section through a grate adjusted for large fuel,

Fig. 8 is a longitudinal section through a part of a grate showing the arrangement for forming a stepped grate,

Fig. 9 is a longitudinal section through a part of a grate adjusted for ver large fuel,

Figs'lo and 11 show a grate bar of a different shape in cross section and in plan.

011 the longitudinal supporting members 1 which are provided with pockets formed by lateral serrated projections S, the grate bars 4, are laid in such a manner that they mutually cover one another. The projections 3, are shaped in such a manner that in the resulting inclined position of the grate bars 4, the upper limbs or webs of the latter form a flat'grate surface, whilst the lower limbs or webs serve as coolingribs. Each gratebar (Figs. 5 and 6) consists of a casting 4 exhibiting in cross section two limbs or webs arranged at an obtuse angle, which castingis provided with ribs 6, G of withlateral projections 14, and with coned holes 5, 5, 5 intended for the passage of air. Near the lino of intersection of the limbs forming the obtuse angle, incisions 7, 7 are provided and the said ribs 6, 6 are provided with projections 18, 19 of unequal size, the purpose of which will be hereinafter made clear. The furnace is rendered air tight with regard tothe furnace doorby means of a cover plate 10, whilst the member 9 serves a V In the case of broad grates intermediary longitudinal supporting members 13 (F ig, 3) may be provided which are likewise furnished with projections 3.

s thegrate bars 41 are manufactured in standard lengths, larger or smaller intermedia-ry spaces will remain between the longitudinal members and in some cases between the transverse members) and the walls of the furnace, which spaces have to be covered up. For this purpose according to the invention cast or rolled members 11 each 0 7 i prov ded with three lateral ribs oi unequal width spaced at peripheral angles of about 120 apartfrom one another are provided. The member 11 is so arranged that one rib (for instance 23 in Fig. 3) rests on the edge of the grate, whilst another rayor arm (for instance 22) rests against the wall ofthe furnace. The positioning of the arms with depend upon the distanceof the" edge of the grate from the furnace wall; The arrangement shown in Figs. 1 and2 represents a grate for coal dustor small coal. The upper arms of the grate bars lie quite flat and the projections 14 of the grate bar ribs .6 rest in the incisions 7. The grate bars are ar ranged in two sections which are inclined in opposite directions. The medial oppositely inclined adjacent grate bars rest on atrans- Verse supporting member 8, the ends of special shape,

which. rest in corresponding pockets formed y projections on the longitudinal support ing members 1, 13. By raising the transverse supporting member the grate bars can be set to a greater angle of inclination with the horizontal.

In order to obtain a grate for larger fuel, the longitudinal supporting members 1 are so turned that their projections 12 (Figs. 7 and 1) come into use which latter are provided with serrated pockets 20. The breadth of the pockets is greater than the thickness of the grate bars l, so that intermediate spaces 21 remain between the said grate bars and the pockets. The transverse supporting member 15 is providedin this case with a stepped foot 16 which, as shown in Fig. 7, fits into a correspondingly shaped stepped pocket 17.

In this position, all the grate bars 1 lie at a somewhat greater angle of inclination with the horizontal and the small ribbed projections 18 rest in each case on the middle peaks of the grate bars adjacent to them. In this manner a grate suitable for larger coal is obtained.

If the grate'is to be employed for burning large coal, then all the grate bars 4; are turned, as shown in Fig. 9, in such manner that the larger ribbed projections 19 are uppermost and the smaller projections18 are below them. The middle transverse supporting member 15 is then likewise turned in such manner that the step 16 rests on the projection 17 whereby a higher position of the transverse member 15 is obtained. l/Vith this arrangement the grate bars take up the inclined position shown in Fig. 9, in which the projections 19 rest in each case on the middle peaks of the adjacent grate bars.

For the construction of stepped grates or the like grate bars 29 of simpler form, for instance of symmetrical form (Figs. 10 and 11) may be employed. These are provided with flat surfaces without incisions and are also furnished with air openings, simple'ribs 30, 30( andcastprojections 31,132. The application of such grate bars for stepped grates is clearly shownin Fig. 8 from which it will be seen that the fire bars 29 rest in the alternate pockets of the inclined longitudinal supporting members 1", whereby the characteristic form of the stepped grate is obtained.

Q It will, ofeourse', be understood that the scope of tlie'invention is not limited to the constructional examples illustrated.

I claim: v

1. A furnace grate comprising in com-; bination, a plurality of transversely arranged grate bars, each consisting of an upright web .and an inclined web extending throughout the length of the bar, arranged at an obtuse angle to each other and provided with air passages; each bar being provided with transverse ribs having projections contacting with adjacent bars,- supporting members extending longitudinally of the grate and provided with pockets opening laterally and upward, and adapted to receive the ends of said upright webs for supporting the bars and formed to permit a limited rocking motion of the bars therein; the bars being arranged so that their inclined webs form a fuel supporting surface; a vertically adjustable member extending transversely of the grate adjacent one of said bars and engaging the inclined web thereof, and means for supporting said member in different vertical positions, thereby to hold the grate bars with their inclined webs at different inclinations.

2. A furnace grate as specified in claim 1, wherein the grate bars are divided into two sections, the inclined webs of the constituent grate bars of the one section being inclined to the horizontal in the opposite directionto the direction of inclination to the horizontal of the inclined webs of the constituent grate bars of the other section.

- 3. A furnace grate comprising in combination, a plurality of transversely arranged grate bars, each consisting of an upright web and an inclined web extending throughout the length of the bar, arranged at. an obtuse angle to each other and provided with air v passages; each bar belng provided with transverse ribs having projections contacting with adjacent bars; supporting members extending long-itudinallyof the grate and provided with pockets opening laterally and upward, and adapted to receive the ends of said upright webs for supporting the bars and formed to permit a limited rocking motion of the bars therein; the bars being arranged so that their inclined webs form a fuel supporting surface; a vertically adjustable member extending transversely of the grate adjacent one of said bars and engaging the in-. clined web thereof; a stepped foot on said vertically adjustable member; and steps on v said supporting members into which said stepped foot fits for supporting said vertically adjustable member in different vertical positions, thereby to hold the grate bars with their inclined webs at different inclinations.

4. A furnace grate as specified in claim 1, in further combination with: amember extending longitudinally of the grate; three lateral ribs of unequal width on said member spaced at peripheral angles of about apart from oneanother, said member being located so as to cover'up the intermediate space between the fuel supporting surface and the furnace wall, and one of said ribs resting on the edge of the fuelsupporting surface and the other on the furnace Wall.

Signed at Warsaw, Republic of Poland this fourteenth day of November, 1928.

ING; TADEUSZ GQEBEL. 

